BMW & Mini CAS (Car Access System)
Immobilizer, key recognition, and ignition authorization.
Covers all generations from EWS1–4 and CAS1–4 to FEM/BDC. Manages key validation, ignition enable, and steering lock. Cloning requires synchronization with DME/DDE and instrument cluster.
Vad är BMW CAS / FEM / BDC och vilken roll har den i fordonet?
Övergripande definition
CAS (Car Access System) is BMW’s central access and immobilizer computer, storing encrypted key hashes, ISN codes, and authorizing ignition start sequences.
Kritiskt beroende & stöldskydd
Interrogates key transponders, triggers Terminal 15/30 relays, commands the electronic steering column lock (ELV), and exchanges ISN handshakes with DME/DDE.
Internal Hardware Architecture
What is inside the module? Microcontrollers, memory types, and bus networks.
Processor / MCU
- ›Motorola MC68HC11
- ›Motorola MC9S12DG256 (2K79X)
- ›MC9S12XDP512 (0L15Y/0M23S)
- ›MC9S12XEP100 (1N35H/5M48H)
- ›Renesas V850 + EEPROM 95128/95256
Memory Architecture
- ›Mask ROM
- ›EEPROM 95128
- ›EEPROM 95256
- ›D-Flash / P-Flash Secure
Bus Networks
- ›K-CAN (100 kbps)
- ›PT-CAN (500 kbps)
- ›K-Line
- ›Ethernet / FlexRay (F-serie)
Kritiska interna komponenter på mönsterkortet
Generations & Revisions
Hardware architectures differ significantly across model years and platforms.
EEPROM extraction and ISN/transponder mapping into matching unit.
EWS Platform
- ✓Dedicated discrete immobilizer module
- ✓Rolling code counter
- ✓K-Line diagnostic bus
- !Internal starter relay contacts weld
- !Transponder ring antenna degradation
- !Rolling code desynchronization on dead battery
Vehicle Functions
- 1Key recognition and engine start authorization
- 2Electronic steering lock (ELV) unlocking sequence
- 3Terminal distribution (Kl. 15, Kl. R, Kl. 30)
- 4Central diagnostic gateway node
Common Faults & Symptoms
- Yellow or red steering lock (ELV) warning icon
- No ignition power / no crank condition
- Remote unlocks doors but engine will not crank (tampering fault)
- DTC 2F44 or 4A63 stored in DME/DDE
- CAS processor flash corrupt after jump-start voltage spike
Diagnostic Trouble Codes (DTC)
DME: EWS manipulation protection active / start blocked.
DDE: EWS tampering / rolling code desync between CAS and DDE.
CAS: ELV (electronic steering lock) internal hardware jam / fault.
CAS: Control module internal processor fault or EEPROM corruption.
CAS: Brake light switch signal missing / gear interlock not satisfied.
Searchable Article Numbers & OEM Codes
Compare donor part numbers and locate compatible replacements.
How Cloning & Repair Works
We connect directly to the CAS MCU/EEPROM on our programming bench, decrypt the ISN codes and transponder slot matrix. All data is transferred and verified on the replacement unit so existing keys and DME/DDE operate without on-car adaptation.
Vad vi kan utföra på laboratoriet:
Behöver du klona eller reparera din BMW CAS / FEM / BDC?
Skicka in din trasiga originalenhet tillsammans med en begagnad donator, så utför vi 100% 1:1 kloning med 12 månaders garanti.